From fadad878cc0640cc9cd5569998bf54b693f7b38b Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Thu, 24 Jan 2008 08:54:47 +0100 Subject: kernel: add CLONE_IO to specifically request sharing of IO contexts syslets (or other threads/processes that want io context sharing) can set this to enforce sharing of io context. Signed-off-by: Jens Axboe --- kernel/fork.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) (limited to 'kernel') diff --git a/kernel/fork.c b/kernel/fork.c index 1987c57abb08..314f5101d2b0 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -792,15 +792,21 @@ out: return error; } -static int copy_io(struct task_struct *tsk) +static int copy_io(unsigned long clone_flags, struct task_struct *tsk) { #ifdef CONFIG_BLOCK struct io_context *ioc = current->io_context; if (!ioc) return 0; - - if (ioprio_valid(ioc->ioprio)) { + /* + * Share io context with parent, if CLONE_IO is set + */ + if (clone_flags & CLONE_IO) { + tsk->io_context = ioc_task_link(ioc); + if (unlikely(!tsk->io_context)) + return -ENOMEM; + } else if (ioprio_valid(ioc->ioprio)) { tsk->io_context = alloc_io_context(GFP_KERNEL, -1); if (unlikely(!tsk->io_context)) return -ENOMEM; @@ -1176,7 +1182,7 @@ static struct task_struct *copy_process(unsigned long clone_flags, goto bad_fork_cleanup_mm; if ((retval = copy_namespaces(clone_flags, p))) goto bad_fork_cleanup_keys; - if ((retval = copy_io(p))) + if ((retval = copy_io(clone_flags, p))) goto bad_fork_cleanup_namespaces; retval = copy_thread(0, clone_flags, stack_start, stack_size, p, regs); if (retval) -- cgit v1.2.3